4D

[mitea_dan]

http://youtu.be/3AkKQmDgOV8
Enjoy.

[Kevin Rochon]

First time I've seen it on that big a size plane:eek:

[briankizner]

veiry impressive. Is reverse thrust done by reversing an electric motor or variable pitch prop?

[Sempai-mj]

veiry impressive. Is reverse thrust done by reversing an electric motor or variable pitch prop?

I believe it was the prop.

[JimmyG]

Looks like a heli prop variable pitch. I assume the pitch is mixed with the throttle as u would do flying a heli

[MidnightHeli]

Verstellpropeller = pitch propeller, and you can see it at the beginning of the video.